Dog Ear Infection Signs: How to Spot & Treat It Early

Ear infections are one of the most common — and most uncomfortable — problems dogs face, and the deep, L-shaped canal of a dog's ear makes them especially prone. The good news is that ear infections announce themselves early: head shaking, scratching and a distinctive smell are hard to miss once you know what you're looking for. Spotting the signs quickly means faster relief for your dog and simpler treatment. Here's what to watch for, why it happens, and when to see a vet.

What does a dog ear infection look like?

A healthy dog's ear is pale pink inside, clean, and virtually odourless. An infected ear looks and smells noticeably different, and your dog will usually tell you it's uncomfortable long before you peer inside. Because the ear canal bends downward and inward, moisture and debris get trapped easily, creating the warm, damp environment that yeast and bacteria love. That's why floppy-eared and water-loving dogs are affected so often — and why early signs matter.

The key signs of a dog ear infection

1. Head shaking and tilting

Persistent head shaking, or holding the head tilted to one side, is often the very first sign. Your dog is trying to dislodge the irritation deep in the canal.

2. Scratching and rubbing

Pawing at one ear or dragging the head and ear along carpet and furniture signals itch and discomfort in that ear.

3. Odour

A yeasty, sweet or downright foul smell coming from the ear is a classic infection giveaway, and one of the most reliable early clues.

4. Redness and swelling

The inside of the ear flap and canal may look red, inflamed or swollen, and feel warm to the touch.

5. Discharge and waxy buildup

Brown, yellow or bloody discharge, or a heavy waxy buildup, points to an active infection rather than normal wax.

6. Pain and sensitivity

Flinching, yelping or pulling away when you touch the ear, or a reluctance to be petted around the head, shows the ear is sore.

What causes ear infections in dogs?

Ear infections are usually driven by an overgrowth of yeast or bacteria, triggered by an underlying cause such as:

• Trapped moisture after swimming or bathing — the number-one avoidable cause
• Allergies (food or environmental), which are the most common root cause of recurring infections
• Floppy or hairy ears that reduce airflow and trap warmth and debris
• Ear mites, especially in puppies and multi-pet homes
• Excess wax, grass seeds or foreign objects lodged in the canal
• Over-cleaning or using cotton buds, which can push debris deeper and irritate the canal

How to help & prevent ear infections

• Dry your dog's ears gently after every swim and bath — a quick wipe of the outer ear removes the moisture infections thrive on.
• Clean ears routinely with a vet-approved ear cleaner and soft cotton pads; a simple grooming kit makes this easy and keeps buildup in check between vet visits.
• Never insert cotton buds deep into the canal — clean only what you can see.
• Keep the hair around the ear opening trimmed in fluffy breeds to improve airflow.
• Address underlying allergies with your vet, since recurring infections are often an allergy in disguise.

When to see a vet

Because dogs' ear canals are deep and L-shaped, an infection you can smell may already be well established — so an active infection should always be treated by a vet, who can identify whether it's yeast, bacteria or mites and prescribe the right medication. See a vet promptly for odour, discharge, redness, swelling, constant head shaking or pain. Seek same-day care if the ear is bleeding, your dog is very distressed, or there's a head tilt, loss of balance or hearing changes, as these can signal a deeper middle-ear infection. Never use leftover medication or human ear drops, and don't attempt to flush an ear at home if the eardrum could be damaged.

Frequently asked questions

What are the first signs of a dog ear infection?

The earliest signs are usually head shaking, scratching or pawing at one ear, and rubbing the head along the floor or furniture. You may also notice a yeasty or unpleasant smell, redness inside the ear flap, or a brown, yellow or waxy discharge. Catching it at this stage — before the ear becomes very sore or swollen — makes treatment quicker and easier.

Can I treat a dog ear infection at home?

You can support ear health at home with routine cleaning using a vet-approved ear cleaner and by keeping ears dry after swimming and baths, but an active infection needs veterinary treatment. Dogs' ear canals are L-shaped and deep, and the wrong product on a ruptured eardrum can cause harm. A vet identifies whether it's yeast, bacteria or mites and prescribes the correct medication.

When should I take my dog to the vet for an ear infection?

See a vet promptly if you notice a foul smell, discharge, redness or swelling, constant head shaking or scratching, pain when the ear is touched, or a head tilt. Seek same-day care if your dog seems very distressed, the ear is bleeding, or there is loss of balance or hearing — these can point to a deeper or middle-ear infection that needs urgent treatment.

This guide is educational and not a substitute for professional veterinary care. If you're worried about your dog, contact your vet.